ANC4 noise canceller
This is one of the most valuable items in the shack. After the rig and antenna, it is the most valuable piece of equipment - even more so than something basic like a rotator!
It is tricky to set up and also to tune - it can be a curse, but also a blessing!
How does it work? It captures noise, using a noise antenna, and changes the phase and magnitude so it will cancel out the noise that enters the signal antenna. So 2 antennas need to be used - one to capture as much signal as possible (normal) and the other to capture as much noise as possible (and as little signal as possible)
How does it work?
My first article on it.
My second article on it.
Toni, I0JX's comments on it
The Timewave details for it. Timewave is now the manufacturer of the ANC-4
Bob K1SIX: how to measure noise degradation, plus using ANC-4
Updated Nov 20, 2000